Valvespring Suggestions
Thread Starter
Supporting Vendor
Joined: Jul 2010
Posts: 8,547
Likes: 896
From: Republic of Texas
Valvespring Suggestions
I have the following setup:
97 LS1 ~130K miles
1.8 YT rockers
Just added a vortech V2 supercharger.
I'm currently running on stock valve springs. Been running them for about 10000 miles without any significant noticeable problems. Early dyno runs showed valve float above 5000 rpm, but otherwise they seem to be working.
I'm worried that they're the weakest link in the chain at the moment and would like to upgade them. I would appreciate any suggestions (both brand/model and vendor)
97 LS1 ~130K miles
1.8 YT rockers
Just added a vortech V2 supercharger.
I'm currently running on stock valve springs. Been running them for about 10000 miles without any significant noticeable problems. Early dyno runs showed valve float above 5000 rpm, but otherwise they seem to be working.
I'm worried that they're the weakest link in the chain at the moment and would like to upgade them. I would appreciate any suggestions (both brand/model and vendor)
Melting Slicks
Joined: Nov 2008
Posts: 2,938
Likes: 65
From: Rochester Hills MI
you would need ls6 springs at the very least if you are running a stock cam. the 1.8 rockers with a stock ls1 cam give the same valve lift as a stock ls6. id get something aftermarket though. i see too many threads about broken ls6 springs.
Former Vendor
Joined: Feb 2007
Posts: 17,337
Likes: 39
From: Birmingham, AL www.hinsonsupercars.com 205-909-9402
I would recommend some Patriot Dual Springs.
http://hinsonsupercars.com/s-297-valvesprings.aspx
Seth
http://hinsonsupercars.com/s-297-valvesprings.aspx
Seth
Safety Car
Joined: Jul 2004
Posts: 3,904
Likes: 29
From: Vancouver Washington
Assuming you are going to keep the rev limiter at the factory settings I would consider some PAC 1218s as a minimum and the PAC 1518s would be better. New springs and some upgraded push rods and you're set to go.
Pro
Joined: Oct 2005
Posts: 733
Likes: 0
From: Vanceboro NC
No need for a heavy duel spring to rob horse power on your setup.
Melting Slicks
Joined: Apr 2010
Posts: 3,203
Likes: 0
I would recommend some Patriot Dual Springs.
http://hinsonsupercars.com/s-297-valvesprings.aspx
Seth
http://hinsonsupercars.com/s-297-valvesprings.aspx
Seth
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Le Mans Master
Joined: Mar 2002
Posts: 5,955
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From: PNW
I would recommend some Patriot Dual Springs.
http://hinsonsupercars.com/s-297-valvesprings.aspx
Seth
http://hinsonsupercars.com/s-297-valvesprings.aspx
Seth
Team Owner
Joined: Mar 1999
Posts: 22,025
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From: At the beach in little Rhody
Tech Contributor
Joined: May 2008
Posts: 2,843
Likes: 16
From: Howell Michigan
St. Jude Donor '09-'10-'11
Seeing you have a stock cam, and with your 1.8 rockers, I would suggest using new LS6 stock springs, part number 12586484. This spring is good up to .552 of valve opening. Your stock 1997 cam with the stock rocker ratio of 1.6 has .479 exhaust and .472 intake lift. With the 1.8 rocker and your stock cam you increase lift to .538 exhaust and .532 intake. Close force would be ~90 lbf. Valve open would be ~285 lbf. 
Tech Contributor
Joined: May 2008
Posts: 2,843
Likes: 16
From: Howell Michigan
St. Jude Donor '09-'10-'11
1215 is designed for .600 lift and 1518 for .650 lift. You don't have that much lift. Short of shimming springs you stand more of a chance of early valve float going with a spring designed for a higher lift cam compared to the stock LS6. Best of luck!
Former Vendor
Joined: Apr 2006
Posts: 2,470
Likes: 2
From: Portland OR
St. Jude Donor '10-'11-'12
OD: 1.290"
130 lbs @ 1.800"
337 lbs @ 1.150"
Lift: 0.650"
OD: 1.290"
130 lbs @ 1.800"
337 lbs @ 1.150"
Lift: 0.650"
They read the same, the 1518 is nitrided. We keep the 1518 in stock.
130 lbs @ 1.800"
337 lbs @ 1.150"
Lift: 0.650"
OD: 1.290"
130 lbs @ 1.800"
337 lbs @ 1.150"
Lift: 0.650"
They read the same, the 1518 is nitrided. We keep the 1518 in stock.
Last edited by 99blancoss; Sep 1, 2010 at 10:43 AM.
Pro
Joined: Oct 2005
Posts: 733
Likes: 0
From: Vanceboro NC
Seeing you have a stock cam, and with your 1.8 rockers, I would suggest using new LS6 stock springs, part number 12586484. This spring is good up to .552 of valve opening. Your stock 1997 cam with the stock rocker ratio of 1.6 has .479 exhaust and .472 intake lift. With the 1.8 rocker and your stock cam you increase lift to .538 exhaust and .532 intake. Close force would be ~90 lbf. Valve open would be ~285 lbf.
Tech Contributor
Joined: Jan 2007
Posts: 19,413
Likes: 1,144
From: Dyer, IN